Fix timestamps in custom data algorithms (#5426)

* Correct custom data timestamp and match performance across languages

* Add EndTime property

* Add comment for crypto SetHoldings

Algorithm.Python/CustomDataNIFTYAlgorithm.py

@@ -72,7 +72,7 @@ class CustomDataNIFTYAlgorithm(QCAlgorithm):
         if self.Time.weekday() != 2: return
 
         cur_qnty = self.Portfolio["NIFTY"].Quantity
-        quantity = math.floor(self.Portfolio.MarginRemaining * 0.9) / data["NIFTY"].Close
+        quantity = int(self.Portfolio.MarginRemaining * 0.9 / data["NIFTY"].Close)
         hi_nifty = max(price.NiftyPrice for price in self.prices)
         lo_nifty = min(price.NiftyPrice for price in self.prices)
 
@@ -103,6 +103,7 @@ class Nifty(PythonData):
             # 2011-09-13  7792.9    7799.9     7722.65    7748.7    116534670    6107.78
             data = line.split(',')
             index.Time = datetime.strptime(data[0], "%Y-%m-%d")
+            index.EndTime = index.Time + timedelta(days=1)
             index.Value = data[4]
             index["Open"] = float(data[1])
             index["High"] = float(data[2])
@@ -132,6 +133,7 @@ class DollarRupee(PythonData):
         try:
             data = line.split(',')
             currency.Time = datetime.strptime(data[0], "%Y-%m-%d")
+            currency.EndTime = currency.Time + timedelta(days=1)
             currency.Value = data[1]
             currency["Close"] = float(data[1])